/*
 * Copyright (c) 2005-2011, Michael Newcomb
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package net.sf.ohla.rti.util;

import java.util.Iterator;
import java.util.NoSuchElementException;

public class EmptyIterator<E>
  implements Iterator<E>
{
  public static final EmptyIterator INSTANCE = new EmptyIterator();

  @Override
  public boolean hasNext()
  {
    return false;
  }

  @Override
  public E next()
  {
    throw new NoSuchElementException();
  }

  @Override
  public void remove()
  {
    throw new UnsupportedOperationException();
  }

  @SuppressWarnings("unchecked")
  public static <E> EmptyIterator<E> instance()
  {
    return (EmptyIterator<E>) INSTANCE;
  }
}
